SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b01534b7368286f44f9e472b8eefccc6da8a697dfd51a3107ce0939a8ffb392' 
  AND token = 'kzzLoGvnKuWln0wlk/C5r/Klgz2ePI/p5QwQvkYCs50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}